title: Improving the corrosion resistance of Mg-4.0Zn-0.2Ca alloy by micro-arc oxidation.
abstract: In this paper, corrosion resistance of the Mg-4.0Zn-0.2Ca alloy was modified by micro-arc oxidation (MAO) process. The microstructure and phase constituents of MAO layer were characterized by SEM, XRD and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of MAO treated Mg-4.0Zn-0.2Ca alloy in the simulated body fluid were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The microstructure results indicated that a kind of ceramic film was composed by MgO and MgF2 was formed on the surface of Mg-4.0Zn-0.2Ca alloy after MAO treatment. The electrochemical test reveals that the corrosion resistance of MAO treated samples increase 1 order of magnitude. The mechanical intensity test showed that the MAO treated samples has suitable mechanical properties.
authors.affiliation: The First Affiliated Hospital of Harbin Medical University, Harbin 150001, PR China.
authors.forename: Y H
authors.initials: YH
authors.lastname: Xia
authors.forename: B P
authors.initials: BP
authors.lastname: Zhang
authors.forename: C X
authors.initials: CX
authors.lastname: Lu
authors.forename: L
authors.initials: L
authors.lastname: Geng
mesh_terms: D000497:Alloys / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D003343:Corrosion; D008274:Magnesium / Q000737:chemistry*; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D013718:Tensile Strength; D015032:Zinc / Q000737:chemistry*
chemical_list: D000497:Alloys; D008274:Magnesium; D015032:Zinc; D002118:Calcium
keywords: Biodegradation; Corrosion resistance; Mg–Zn–Ca; Micro-arc oxidation; Microstructure